For my 75 gallon aquarium - 22 gallon sump (sterlite 90 quart container), quiet one 6000 pump. Rated at a little over 1500 GPH, but with head height and 90's, I think I'm running around 900 GPH. I'm using stackable drawers for a trickle filter and have around 8 gallons of bio media (mainly scrubbies).